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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf395fe7732de761f8589df6bbbf72d3a7980625d695cf0724d0d12d4bf887bf' 
  AND token = '3ys1dYkDqmLGxoBBvPwMvdE/BWoKn7Cie/LlJw6Yftc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}